Nice male you got
About calling,this is my experience : my male Elvis ( about 1 yr old) doesn't call every night; he can stay mute for days and then "sing" for 3-4 times in row,and always at night or late evening,when the room is dark and there's quiet.
Don't expect him to call in daytime or if ,in someway, there's light and people (visible to him)...that's only my personal experience,it's not the Holy Bible of course